import core.time : hnsecs, minutes;
import std.datetime.date : DateTime;
import std.datetime.timezone : SimpleTimeZone;
import std.datetime.systime : SysTime;

auto dt = DateTime(1982, 4, 1, 20, 59, 22);
auto tz = new immutable SimpleTimeZone(-330.minutes);
auto st = SysTime(dt, 1234567.hnsecs, tz);
Timestamp ts = st;

assert(st.toISOExtString == ts.toString);
assert(st == cast(SysTime) ts);